How to Weigh and Record Your Packaging for EPR Reporting

Table of Contents

• Why Accurate Weighing Matters
• What Counts as Packaging?
• Primary, Secondary, Tertiary, and Shipment Packaging
• Weighing Methods
• Weighing Equipment Recommendations
• Recording Best Practices
• Common Weighing Mistakes
• Packaging Audit Process: Step by Step
• Spreadsheet vs Platform Approach
• Industry-Specific Guidance

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Key Takeaways

• Accurate weighing is essential — over-reporting costs you money in higher fees, under-reporting risks enforcement action and penalties.
• Individual weighing is most accurate for high-value items; batch weighing is practical for small or numerous items.
• EPR covers all packaging including items often overlooked: packing tape, labels, void fill, polybags, and shrink wrap.
• Supplier specification sheets are the easiest and most accurate data source — request them for every packaging component.
• Record as you go — monthly data entry is far more reliable than annual retrospective estimation.
• A dedicated platform eliminates spreadsheet errors and generates RPD-ready files automatically.

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One of the most practically challenging aspects of packaging EPR compliance is determining the weight of every type of packaging your business handles. The accuracy of your weight data directly affects your fee calculation — and therefore how much you pay. Over-reporting means paying more than you owe. Under-reporting means risking enforcement action and penalties from the Environment Agency.

This guide provides practical, hands-on advice for weighing and recording packaging across different business types, with specific methods for each packaging category.

Why Accurate Weighing Matters

Your EPR fees are calculated as weight (in tonnes) multiplied by the fee rate for each material type. Even small inaccuracies, multiplied across thousands of units, can result in significant over- or under-payment.

The Cost of Over-Reporting

If you estimate your cardboard shipping boxes at 350g each but they actually weigh 280g, and you ship 100,000 boxes per year:

• Over-estimated weight: 100,000 x 350g = 35,000 kg (35 tonnes)
• Actual weight: 100,000 x 280g = 28,000 kg (28 tonnes)
• Over-reported: 7 tonnes of paper/card
• Unnecessary fees paid: 7 x £196 = £1,372 overpaid

The Cost of Under-Reporting

Conversely, if you forget to include transit packaging (pallet wrap, strapping, corner protectors) and under-report by 5 tonnes of plastic:

• Unreported fees: 5 x £423 = £2,115 underpaid
• Enforcement risk: Under-reporting can trigger regulatory audits, compliance notices, and variable monetary penalties that exceed the underpaid amount

The goal is accuracy, not estimation. The methods below will help you achieve reliable weight data.

What Counts as Packaging?

Before weighing anything, you need to identify everything that qualifies as packaging under the EPR regulations. The definition is broader than many businesses expect.

Included as Packaging

• Sales packaging: Boxes, bottles, jars, bags, blister packs, tubes, cartons, cans, trays
• Grouping packaging: Multipack wrappers, cardboard sleeves, shrink-wrapped bundles, carrier bags
• Transit packaging: Corrugated shipping cases, pallet wrap, strapping, edge protectors, foam inserts, timber pallets
• Shipment packaging: E-commerce mailer bags, padded envelopes, shipping boxes, void fill
• Closures and accessories: Caps, lids, pumps, sprayers, dropper assemblies
• Labels: Adhesive labels on products and packaging (paper or plastic)
• Tape: Packing tape, box sealing tape
• Documentation sleeves: Plastic wallets for delivery notes
• Desiccant and absorbent pads: Sachets placed inside packaging to protect the product
• Hangers: Packaging hangers for retail display (plastic or card)
• Gift wrapping: If provided as part of the product offering

Not Packaging

• Product components that are integral to the product and consumed with it (e.g., a tea bag is the product, not packaging)
• Reusable containers retained by the business in a closed-loop system (though they have separate reporting requirements)
• Transport containers like shipping containers or vehicle bodies

The Grey Areas

Some items fall into grey areas where it is not immediately obvious whether they count as packaging. The general rule is: if the item is discarded by the end consumer or retailer and is not part of the product itself, it is likely packaging. When in doubt, include it — it is better to slightly over-report than to be found under-reporting in an audit.

Primary, Secondary, Tertiary, and Shipment Packaging

EPR requires you to classify each packaging item into one of four categories. The category does not affect the fee rate (fees are based on material type), but it must be reported correctly in your RPD submission.

Primary Packaging (P1)

The packaging that directly contains or protects the product and is typically disposed of by the end consumer.

Examples: A shampoo bottle, a cereal box, a polybag around a garment, a glass jar of jam, a blister pack for batteries.

Weighing tip: Primary packaging weights are usually well-documented in supplier specifications. Request packaging spec sheets that list the weight of each component (bottle, cap, label, etc.).

Secondary Packaging (P2)

Packaging used to group multiple units of a product together. It is often removed at the retail point and may be disposed of by the retailer or the consumer.

Examples: A cardboard tray holding 6 bottles, shrink wrap around a multipack of cans, a cardboard sleeve grouping two products together.

Weighing tip: Weigh the grouping packaging separately from the products it contains. For shrink wrap, weigh a known area or length and calculate the weight per unit.

Tertiary Packaging (P3)

Transit and distribution packaging used to transport goods through the supply chain. It is typically removed at the distribution centre or retailer and does not reach the end consumer.

Examples: Corrugated outer cases, pallet wrap, strapping, edge protectors, foam inserts in transit cases, wooden pallets, slip sheets.

Weighing tip: Transit packaging is often the most overlooked category. Walk through your warehouse and loading area to identify every piece of packaging used in distribution. Weigh complete palletised loads and subtract the product weight to calculate total transit packaging weight.

Shipment Packaging (SP)

Packaging used to ship products directly to end consumers, typically in e-commerce and direct-to-consumer channels.

Examples: Mailer bags, e-commerce shipping boxes, padded envelopes, void fill (paper, air pillows, foam peanuts), tissue paper wrapping, packing tape on consumer shipments.

Weighing tip: For e-commerce, weigh a complete packaged order (box + void fill + tape + any inner wrapping) and subtract the product weight. Do this for several representative order sizes to get average weights.

Weighing Methods

Method 1: Individual Item Weighing

Weigh each distinct packaging item individually using a precise scale. This is the most accurate method and is recommended for high-value items or items with significant weight variation.

Best for: Primary packaging (bottles, boxes, jars), secondary packaging (multipack wrappers), closures and accessories.

Process:

1. Obtain 5-10 samples of the packaging item
2. Weigh each sample on a calibrated scale
3. Calculate the average weight
4. Record the average weight alongside the material type and packaging category
5. Multiply by annual unit volume to calculate annual tonnage

Example: Weighing a plastic shampoo bottle.

• Sample 1: 42g, Sample 2: 41g, Sample 3: 43g, Sample 4: 42g, Sample 5: 41g
• Average: 41.8g
• Annual units: 500,000
• Annual weight: 500,000 x 41.8g = 20,900,000g = 20.9 tonnes

Method 2: Batch Weighing

Weigh a known quantity of identical items together, then divide by the count to get the per-unit weight. This is practical for lightweight items where individual item weighing is difficult.

Best for: Polybags, labels, packing tape segments, small closures, lightweight inserts.

Process:

1. Count out a batch of identical items (e.g., 100 polybags)
2. Weigh the entire batch
3. Divide total weight by the count to get per-unit weight
4. Multiply by annual unit volume

Example: Weighing polybags.

• 100 polybags weigh 480g
• Per-unit weight: 4.8g
• Annual units: 300,000
• Annual weight: 300,000 x 4.8g = 1,440,000g = 1.44 tonnes

Method 3: Roll or Spool Weighing

For packaging materials supplied on rolls (stretch wrap, packing tape, shrink film, labels on rolls), weigh a full roll and divide by the number of uses per roll.

Best for: Pallet wrap, packing tape, shrink film, label rolls.

Process:

1. Weigh a new, unused roll (subtract the core weight if significant)
2. Determine how many pallets/boxes/products one roll covers
3. Calculate per-use weight
4. Multiply by annual usage

Example: Weighing pallet stretch wrap.

• Full roll weight (minus core): 15 kg
• One roll wraps approximately 60 pallets
• Per-pallet wrap weight: 250g
• Annual pallets wrapped: 5,000
• Annual weight: 5,000 x 250g = 1,250,000g = 1.25 tonnes

Method 4: Supplier Specification Sheets

The easiest and often most accurate method. Request packaging specifications from every supplier, which typically include:

• Material type and grade
• Weight per unit (or per 1,000 units)
• Dimensions
• Component breakdown for multi-material items

Best for: All packaging types, particularly complex items with multiple components.

Process:

1. Contact each packaging supplier and request specification sheets
2. Extract per-unit weights by material
3. Multiply by annual purchase volumes (from purchase orders or invoices)
4. Cross-reference with actual weighing for validation

This method has the added benefit of creating a documented audit trail that regulators can verify against your purchases.

Method 5: Purchase Order Calculation

For packaging bought by weight rather than by unit (common for timber pallets, void fill, and bulk packaging materials), your purchase orders directly provide the weight data.

Best for: Pallets, void fill materials, bulk rolls, packaging materials bought by weight.

Process:

1. Collect all packaging purchase orders for the reporting period
2. Sum the weights by material type
3. Adjust for any stock changes (opening stock vs closing stock)

Weighing Equipment Recommendations

Scale Type	Capacity	Accuracy	Best For
Precision digital scale	0 - 500g	0.01g	Labels, caps, small closures, lightweight films
Bench scale	0 - 30 kg	1g	Bottles, boxes, jars, individual packaging items
Platform scale	0 - 150 kg	10g	Cases, pallets of packaging, bulk materials
Floor scale	0 - 3,000 kg	100g	Full pallets, large transit packaging loads

For most businesses, a bench scale accurate to 1g (costing £50-£150) is sufficient for the majority of packaging items. Invest in a precision scale if you handle many lightweight items like labels and films.

Ensure scales are calibrated regularly. Inaccurate scales produce inaccurate data, which defeats the purpose of careful weighing.

Recording Best Practices

Create a Packaging Register

Maintain a master list of every distinct packaging item your business uses. For each item, record:

• Item name/description (e.g., “Medium shipping box”)
• Material type (e.g., Paper and card)
• Material sub-type (if applicable, e.g., corrugated board)
• Weight per unit (e.g., 280g)
• Packaging category (e.g., SP — Shipment)
• Supplier (for audit trail)
• Date last weighed (trigger re-weighing if specifications change)

Update When Specifications Change

If you switch suppliers or change packaging specifications, update the weight data immediately. A switch from a 350gsm to a 300gsm cardboard box could reduce per-unit weight by 10-15%, which compounds across annual volumes.

Record Monthly, Not Annually

Track packaging quantities (units used) on a monthly basis. Monthly recording:

• Spreads the workload evenly through the year
• Catches data issues early (a month with unexpectedly high or low figures can be investigated while records are fresh)
• Makes half-yearly reporting straightforward for large producers
• Reduces the risk of the retrospective estimation errors that plague annual-only tracking

Reconcile with Purchase Orders

Periodically (quarterly is ideal) reconcile your packaging usage data against purchase orders and inventory records. The packaging you bought, minus what is still in stock, should approximately equal what you used. Significant discrepancies indicate a data collection problem.

Document Your Methodology

The Environment Agency may audit your data submissions and request evidence of how you determined your packaging weights. Having a documented methodology — including the scales used, sample sizes, averaging approach, and data sources — demonstrates due diligence and makes audits smoother.

Common Weighing Mistakes

1. Forgetting Multi-Component Items

A product in a cardboard box with a plastic window, paper insert, and adhesive label contains four packaging components in at least two material types. Weigh each component separately and report under the correct material.

2. Ignoring Lightweight Items

A single adhesive label weighs perhaps 1-2 grams. But 500,000 labels per year equals 500-1,000 kg — up to 1 tonne of paper/card. At £196/tonne, that is nearly £200. Lightweight items add up, and omitting them is a common source of under-reporting.

3. Confusing Gross and Tare Weight

When weighing packaging items, ensure you are weighing the packaging only — not the product inside it. If you weigh a filled bottle, you are measuring the product plus the bottle. Weigh empty packaging components, or subtract the known product weight.

4. Using Estimates Instead of Measurements

“About 300g” is not accurate enough for EPR reporting. Estimates tend to drift upwards (costing you money) or downwards (risking enforcement). Take the time to weigh properly.

5. Not Accounting for Stock Changes

If you bought 10 tonnes of cardboard boxes but have 2 tonnes in stock at year-end (and started with 1 tonne), your actual usage is 10 + 1 - 2 = 9 tonnes. Always adjust for opening and closing stock.

6. Forgetting Import Packaging

If you import goods, the packaging on those goods is your responsibility. This includes transit packaging (outer cases, pallet wrap, strapping) that may be discarded at your warehouse before you ever see it in your normal operations. See our EPR guide for importers for more detail.

7. Double-Counting Shared Packaging

If you buy pre-packaged goods from a UK supplier and resell them, the primary packaging on those goods may already be reported by the supplier (as the brand owner or packer). Do not double-count packaging that another obligated producer is responsible for. However, any additional packaging you add (multipack wrappers, shipping boxes) is your responsibility.

Packaging Audit Process: Step by Step

Use this process to conduct a thorough packaging audit for EPR compliance:

Step 1: Walk the Premises

Physically walk through every area of your business where packaging is used or handled:

• Goods-in area: What packaging arrives with your purchased goods and supplies?
• Storage/warehouse: What packaging is in stock?
• Production/packing area: What packaging do you apply to products?
• Dispatch area: What packaging do you use for shipping?
• Office: Don’t forget packaging on office supplies if handled in significant volumes.
• Returns area: What packaging is used for returns processing?

Take photos and notes of every packaging item you see.

Step 2: Create a Complete Packaging Inventory

List every distinct packaging item identified in Step 1. For each item:

• Assign a reference number or name
• Identify the material type
• Note the packaging category (P1, P2, P3, SP)
• Record the supplier

Step 3: Weigh Each Item

Using the methods described above, determine the weight of each packaging item. Use supplier specifications where available and physical weighing for everything else.

Step 4: Determine Annual Volumes

For each packaging item, calculate how many units you use per year. Sources include:

• Production records (units packed)
• Purchase orders (packaging materials bought)
• Sales data (units sold, multiplied by packaging per unit)
• Shipping records (parcels dispatched)

Step 5: Calculate Annual Tonnage by Material

Multiply per-unit weight by annual volume for each item, then aggregate by material type:

Material	Items	Total Annual Weight (kg)	Weight (tonnes)
Paper and card	Boxes, inserts, labels, tissue paper	25,000	25.0
Plastic	Polybags, tape, stretch wrap, mailers	6,500	6.5
Glass	Product bottles	12,000	12.0
Total		43,500	43.5

Step 6: Validate and Cross-Check

Compare your calculated tonnage against purchase volumes. If you bought 30 tonnes of cardboard packaging during the year but your bottom-up calculation shows only 20 tonnes of usage, investigate the discrepancy.

Spreadsheet vs Platform Approach

The Spreadsheet Approach

Many businesses start by tracking packaging data in Excel or Google Sheets. This can work for simple operations with a small number of packaging items, but it has significant limitations:

Advantages:

• No software cost
• Familiar tools
• Full control over data format

Disadvantages:

• Manual calculation of tonnages and fees — prone to formula errors
• No built-in validation (easy to enter wrong material codes or miss required fields)
• No automatic RPD CSV generation — you must manually format data for submission
• No deadline reminders
• Difficult to track changes and maintain audit trail
• Risk of version control issues with multiple users
• No fee calculation or cost modelling

The Platform Approach

A dedicated EPR compliance platform (like ours) addresses all of the spreadsheet limitations:

Advantages:

• Guided data entry with validation at the point of entry
• Automatic fee calculation using confirmed rates
• RPD-ready CSV export with correct codes and formatting
• Deadline tracking and reminders based on your producer category
• Built-in audit trail
• Nation allocation tools
• Cost modelling for material substitution scenarios
• Multi-user access with role-based permissions

When to switch from spreadsheet to platform:

• When you have more than 10 distinct packaging items
• When multiple people need to enter or access data
• When you find yourself spending more than an hour per month on packaging data management
• When you want fee estimates and cost reduction modelling

Industry-Specific Guidance

E-Commerce / Direct-to-Consumer

Focus on shipment packaging — this is often the largest category by weight. Weigh complete packaged orders at several representative sizes. Do not forget void fill, which can vary significantly between order sizes.

Key items to weigh: shipping boxes (by size), mailer bags, void fill (paper, air pillows, foam), tissue paper wrapping, packing tape, return labels and documentation.

Food and Drink Manufacturing

Primary packaging is typically the largest category. Request detailed specifications from packaging suppliers for every component (bottle, cap, label, seal, sleeve). Pay attention to multi-material items like beverage cartons.

Key items to weigh: bottles/jars/cans, caps and closures, labels, sleeves, trays, films, outer cases, pallet wrap.

Importers

You are responsible for all packaging on imported goods, including transit packaging that may be discarded before products reach your shelves. Arrange with your freight handler or warehouse to weigh and record transit packaging before it is discarded.

Key items to weigh: product packaging, inner packaging, outer cases, pallet wrap, strapping, corner protectors, dunnage, documentation sleeves.

Retail

If you sell products under your own brand (private label), you are responsible for that primary packaging. If you add grouping packaging (multipack wrapping, carrier bags) or transit packaging, those are also your responsibility.

Key items to weigh: own-brand product packaging, carrier bags, multipack wrappers, transit packaging for store deliveries.

Get Started

Accurate packaging data is the foundation of EPR compliance. Our platform makes it easy to record, validate, and report your packaging weights — with built-in weighing guides, validation rules, and automatic fee calculation.

Once you have your weights, you need to classify each item by material type and packaging category, then report your data to DEFRA via the RPD portal. Our EPR compliance checklist walks you through every step, and our fee calculator guide shows you exactly what your packaging will cost.

Start your free trial and simplify your packaging data management, or explore our packaging tools to see how we streamline the process.